LSEG reviews US investment grade fund flow data after JPMorgan flags potential error

When the biggest bank on Wall Street tells a major data provider its numbers might be wrong, people tend to pay attention. LSEG Lipper, the fund analytics arm of the London Stock Exchange Group, is now reviewing its weekly US investment grade fund flow data after JPMorgan Chase flagged what it called a potential error in the figures. The contested data point was a big one. It showed the largest weekly outflows from US investment grade funds in more than six years, the kind of headline number that can move markets, reshape portfolio strategies, and send fixed-income traders scrambling to adjust positions. ## What happened and why it matters LSEG Lipper provides estimated net fund flows on daily, weekly, and monthly cycles across global markets. These numbers are the backbone of how institutional investors, sell-side analysts, and financial media track where capital is moving. JPMorgan published a report noting the outflow figures looked off. The bank didn’t publicly detail the exact nature of the discrepancy, but the implication was clear enough: something in Lipper’s pipeline produced a number that didn’t match JPMorgan’s own tracking of the investment grade space. LSEG has confirm...